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All property sales reported on the Affidavit of Property Value are transmitted to
the assessor's office of the county in which the sale occurred, and the DOR. Each
Affidavit of Property Value is carefully examined to determine if it meets the requirements
for validity as an arm's length transaction. After verification, the sale will be
considered for use in a sales ratio study. Both DOR and the counties perform these
studies at various times during the year.

The basic formula for a sales ratio is:

full cash value

sale price

Sales ratio studies are done in several forms:

by legal class of property use: residential, commercial, or agricultural

by market area or sub-area

by combination of market area and legal class

If the studies disclose discrepancies with the Assessor's full cash values, or inequities
between or within counties, the DOR may request that the Assessor perform field
appraisals within the county, area, class, or classification of the properties where
the discrepancies exist. Adjustments to the values may then be made to achieve equalization
and uniformity. Also the DOR has been given the responsibility of enforcing equity
in property valuation throughout the state. To this end, the DOR may issue what
is called an "equalization order" every year. (The sales ratio study alone is not
sufficient to determine the need for an equalization order, but may be used with
other kinds of data to do so.) An equalization order may be appealed by the Assessor
or any taxpayer affected by the order. Their appeal must be done at the State Board
of Equalization level.